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docs: adjust multi-column most-common-value statistics

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This commit adds a mention that the order of columns specified during
multi-column most-common-value statistics is insignificant, and tries to
simplify examples.

Discussion: https://postgr.es/m/20190828162238.GA8360@momjian.us

Backpatch-through: 12
This commit is contained in:
Bruce Momjian
2019-09-30 13:44:22 -04:00
parent 7524c78874
commit 7e0fb165dd
2 changed files with 5 additions and 4 deletions
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3
doc/src/sgml/ref/create_statistics.sgml
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@ -98,7 +98,8 @@ CREATE STATISTICS [ IF NOT EXISTS ] <replaceable class="parameter">statistics_na
<listitem>
<para>
The name of a table column to be covered by the computed statistics.
At least two column names must be given.
At least two column names must be given; the order of the column names
is insignificant.
</para>
</listitem>
</varlistentry>